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+
Pico 2W Computer Power Controller
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+---
+
+A lightweight MicroPython application for the Raspberry Pi Pico 2W that allows you to remotely power your computer on or off through a secure HTTPS web interface.
+
+## Features
+
+- HTTPS web server
+- Password authentication using HMAC-SHA256
+- Password is never transmitted over the network
+- Replay attack protection using one-time nonces
+- Direct connection to the motherboard's power switch (PW+ / PW−)
+- Automatic Wi-Fi reconnection
+- Lightweight and asynchronous implementation using `uasyncio`
+
+## Required Hardware
+
+- Raspberry Pi Pico 2W (Pico W should also work, but has not been tested)
+- PC817 optocoupler (or equivalent)
+- 220 Ω, 330 Ω or 470 Ω resistor
+- Jumper wires
+
+## Wiring
+
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+The original power button from your computer case can remain connected in parallel with the Pico on PW+ and PW−.
+
+## Setup
+
+### 1. Install MicroPython
+
+Flash the latest MicroPython firmware onto your Pico following the official documentation:
+
+https://www.raspberrypi.com/documentation/microcontrollers/micropython.html
+
+### 2. Generate a self-signed HTTPS certificate
+
+```bash
+openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 3650 -nodes
+openssl x509 -in cert.pem -outform DER -out cert.der
+openssl rsa -in key.pem -outform DER -out key.der
+```
+
+### 3. Configure the project
+
+Create a `config.py` file using `config.example.py` as a template.
+
+### 4. Upload the files
+
+```bash
+mpremote fs cp main.py :main.py
+mpremote fs cp config.py :config.py
+mpremote fs cp cert.der :cert.der
+mpremote fs cp key.der :key.der
+mpremote reset
+```
+
+### 5. View logs
+
+```bash
+mpremote resume
+```
+
+The web interface is now accessible from your local network using the Pico's IP address.
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+To access it from outside your network, you can configure port forwarding or place it behind a reverse proxy.
+
+## Security
+
+The web interface is protected using several mechanisms:
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+- HTTPS encryption
+- HMAC-SHA256 authentication
+- One-time nonces to prevent replay attacks
+- Constant-time HMAC comparison
+- Request size limitation
+
+The password is never sent to the Pico. Instead, the browser computes an HMAC of a server-generated nonce using the password as the secret key.
+
+## License
+
+This project is licensed under the [GPL-3.0 license](LICENSE).
+
+---
+
+If you like this app, consider giving it a star on GitHub!
diff --git a/config.exemple.py b/config.exemple.py
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+WIFI_SSID = "Your wifi ssid"
+WIFI_PASSWORD = "Your wifi password"
+PASSWORD = "Secret code"
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